AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 1 2017, 12:00 AM
 ""AAF: EVEN THOUGH THE RESTAURANT AND OBSERVATORY ARE IN REALITY ALWAYS JUST 1 METRE APART"!!! Sure! ..." Thank you . . . As pointed out earlier, it is not a matter of co-locations; but a matter of relative velocities. If Alice, in the southern suburb of Oslo, is moving relative to the non-attached restaurant, then the light rays, reflected or emitted by that restaurant, will be bent in the forward direction of Alice's motion. And because of that, Alice sees the non-attached restaurant each time in a different spot on the celestial sphere. That is what light aberration is all about; correct?
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 3 2017, 12:00 AM
 ""AAF: However, the light of the red spot changes its direction, on a minute-by-minute basis, NOT because it's intelligent & free; but because the city of Oslo is rotating under the red spot." And, since the Restaurant is always just 1 metre away from the observatory, then Oslo must be rotating relative to the Observatory the exact same way" Pay close attention, please . . . The main point, under discussion here, is quite subtle; even the legendary physicist Albert Einstein couldn't see the slightest glimpse of it. Can you believe it? It's true that the actual position of the non-attached restaurant is always just ONE meter away from the actual position of the attached observatory. But the motion of the observer, in this case, bends the coming light rays from the non-attached restaurant in the forward direction and changes its apparent position, on the celestial sphere, in accordance with Bradley's law of light aberration: http://www.mathpages.com/rr/s2-05/2-05.htm Is everything clear, now?
Anonym

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 3 2017, 7:44 AM
 Yep
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 5 2017, 12:00 AM
 Thanks; Anonym . . . What a smart kid! https://www.youtube.com/watch?v=ARjNeCaB0P8 ….............................................................................................................................................................................. "- and the red and blue photons must travel side-by-side all the way down, so both arriving at Oslo from the same direction. ... Or are you now saying that restaurant and observatory are not ALWAYS just 1 metre apart, but only occasionally - that the earth's rotation takes the observatory away from the restaurant?" Let me repeat one more time: It is not, here, a matter of co-locations; but a matter of relative velocities! The tangential velocity of Alice, in the city of Oslo, bends the coming light rays, from the non-attached restaurant, and changes its apparent position, high in the sky, according to the law of light aberration: http://redshift.vif.com/JournalFiles/V14NO2PDF/V14N2RUS.pdf But at the same time, the true position of the attached observatory remains the same, high in the sky; because the observer (Alice), in this case, has no tangential velocity at all relative to that observatory. And that is what Bradley's law of aberration is all about.
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 7 2017, 12:00 AM
 ""AAF: And that is because the non-attached restaurant has relative motion, as seen from Oslo; while the attached observatory does not have any relative motion with respect to Oslo." Yet again: NO!" Oh; yes! Even in the extreme case, in which the non-attached restaurant & the attached observatory are assumed to be two spots of light occupying exactly the same place, the light rays from the non-attached restaurant must be bent in the forward direction of Alice's tangential velocity. While, by contrast, the light rays from the attached observatory must remain traveling along the same straight lines regardless of whether Alice is moving or at rest. And since according to Bradley's law of light aberration, whenever the light rays are bent in the forward direction of the observer's motion, the separation between the true position & the apparent position of their source is directly proportional to the factor v/c; where v is the tangential velocity of the observer & c is the speed of incident light. That is, after all, what the law of light aberration is all about!
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 9 2017, 12:00 AM
 "It is perfectly possible for two objects to be stationary with respect to each other without a physical connection - and that is explicitly the case with the Observatory and the Restaurant." Is perfectly possible for the non-attached restaurant & the attached observatory to be stationary with respect to each other? I guess not! As a matter fact, it's absolutely impossible for the non-attached restaurant & the attached observatory to be stationary with respect to each other for more than one tiny fraction of a nanosecond. And the main reason behind it, of course, is that the attached observatory is rotating with the earth's angular velocity; while the non-attached restaurant is assumed to have no angular velocity at all. It's that simple!
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 11 2017, 12:00 AM
 "They are always TOGETHER, stationary relative to eachother (always just 1 metre apart), and with exactly the same rotation in ALL respects - and whether or not a beam connects them does not change that." It's a catch-22: https://en.wikipedia.org/wiki/Catch-22_(logic) If the two are assumed to be one attached and one non-attached, then thy can't remain TOGETHER. That is on one hand. On the other hand, if the two are assumed to be always together & stationary relative to each other, then they can't be one attached and one non-attached at the same time. Have I succeeded in making this simple fact of nature very clear at last?
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 13 2017, 12:00 AM
 "And since they are stationary relative to each other, then by definition they have the SAME relative motion as seen from Oslo. ..." No . . . The non-attached restaurant & the attached observatory cannot remain stationary relative to each other. That is because the term 'attached', within the current context, implies, necessarily, that the observatory is rotating, around the North Pole, with the same angular velocity as that of the earth. While, the term 'non-attached', by contrast, implies that the restaurant has no angular velocity whatsoever. PERIOD!
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 15 2017, 12:00 AM
 "Or are you now saying that restaurant and observatory are not ALWAYS just 1 metre apart, but only occasionally - that the earth's rotation takes the observatory away from the restaurant (and so the restaurant is not always over the North Pole)?" Surely; in the case of Earth, I would not just say that the non-attached restaurant and the attached observatory are not, always, just 1 meter apart; but, due to Earth's orbital velocity of about 30 kilometers per second, around the Sun, I would, also, say that the two will, eventually, be millions & millions of miles apart. Am I right?
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 17 2017, 12:00 AM
 ""How adorable & friendly this guy is". Heh, reminds me of the adorable "siberian hamster" on Fawlty Towers - "Cuddle that and you'll never play the guitar again!"" YEP . . . It is true! That 'adorable & cuddly' guy is behaving & acting, all the time, like this Cute Siberian Hamster: https://www.youtube.com/watch?v=9kR5zGYplI4
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 19 2017, 12:00 AM
 ""AAF: I believe that the camera is following the little kid." (or would you prefer ) ..." I would say that I prefer both at the same time! Do you have any objections against that? Here's, once again, the main points of the previous conclusion: 1. The video camera is following the little kid. 2. The little kid is rotating with the tiny merry-go-round. 3. At the same time, things, in the background, are swinging back and forth all time. It follows, therefore, that the video camera must be rotating around its axis.
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 21 2017, 12:00 AM
 "And it's just such a plain, simple, obvious and straightforward video,as well." http://www.shutterstock.com/video/clip-11630222-stock-footage-lovely-child-playing-at-playground-boy-rotating-parents-watching.html Well . . . If it's a plain, simple, obvious and straightforward video, then just go ahead & explain to me, in simple English, please, how it's possible for all things, in the foreground, and all things, in the background, to be rotating, around some stationary axis, in that video, all the time. It's that simple!
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 23 2017, 12:00 AM
 Hi; Ufonaut99 & Jaquecusto: "Professor Stephen Hawking says he's not the only one who believes humans have to find a new planet to populate within 100 years": http://www.wired.co.uk/article/stephen-hawking-100-years-on-earth-prediction-starmus-festival ............................................................................................................................................................................ ""Jaquecusto: Will the gyroscope remain parallel to the tangent of the Earth's curvature, or it will memorize a plane in absolute space?" Interesting question." Well; let's take a closer look: If the wheel is set in motion, at any point of Earth's surface, then the rapidly spinning wheel will keep pointing to the initial direction of the gyroscope, at that point. While, at the same time, the rest of that gyroscope will remain parallel to the tangent of the Earth's curvature. And consequently, we can say, without any hesitation, that the rapidly spinning wheel does memorize a specific 'plane in absolute space'; but the rest of the gyroscope does not. What will Colleague Ufonaut99 say about that? Not very much . . . I presume!
Stanley16

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 25 2017, 12:00 AM
 "One fundamental point - NOTHING in physics "memorizes" anything. Every action at every event operates solely from the factors at that time, not from before." Oh; yeah? How are you going to reconcile that with your arguments for the quantum entanglement in the previous thread? http://www.network54.com/Forum/304711/thread/1366340543/1/%27Spooky+Action+at+a+Distance%27+Aboard+the+International+Space+Station Surely, you supported, back then, the notion that the two entangled particles do remember their 'entangling' past. Am I correct?
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 27 2017, 12:00 AM
 "For example, take Newton's F = ma; if object A gets hit by B travelling at 10kph, it doesn't matter if B has been travelling at 10kph for the past day, or it's only just accelerated to that speed a few seconds ago." That is, absolutely, true. Nonetheless, it's still possible and reasonable, as well, to say that Particle A will continue to remember that 10-kph HIT, as long as the total resultant of external forces, acting upon it, remains equal to zero. Did I get this ONE right?
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

June 29 2017, 12:00 AM
 "So what does that mean for our (sorry, our chinaman's) gyroscope? Well, if the chinaman travels from the north pole to visit Alice in Oslo, and she deliberately tilts the gyroscope (not its platform) to an angle of 30 degrees and holds it there for a few seconds, what happens when it's released?" I, strongly, believe that the traveling 'chinaman' is going to regret it & to feel sorry indeed, if tries to interact very closely with any type of ladies, in any part of Scandinavia, OR doesn't learn anything useful from the careless 'playfulness' of Julian Assange: http://www.bbc.com/news/world-11047811
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

July 1 2017, 12:00 AM
 "Naturally, the gyroscope straightens itself. So logically, it'll do that regardless of whether the gyroscope was started a few seconds ago, or if it was started on the north pole (30 degrees away)." If Alice deliberately tilts the gyroscope (not its platform) to an angle of 30 degrees and holds it there for a few seconds, what happens when it's released? Well . . . Let's look, closely, at that generic gyroscope one more time: And so, it's clear that if Alice tilts the framework of the gyroscope (not the rapidly spinning wheel) to an angle of 30 degrees, or any other angle, and holds it there for a few seconds, THEN nothing will happen to the initial direction of the rapidly spinning wheel, when it's released. The above conclusion is, of course, based upon the implicit assumption that 'wise' Alice would not dare, even in her wildest dreams, to touch or to try to tilt with, her bare hands, the rapidly spinning wheel of the gyroscope. I presume!
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

July 3 2017, 12:00 AM
 "Let's work it through. If the Earth wasn't there, our chinaman would be in a spaceship flying in a circle. In that case, the gyroscope maintains it's plane in space as a result of conservation of angular momentum. The Apollo spacecraft used mechanical gyroscopes like this." That is, absolutely, correct. Gyroscopes are employed in all sorts of flying objects, from the Apollo spacecraft to Kim Jong-un's failed rockets. And that is because gyroscopes are superb instruments for marking directions in Newton's absolute space, without any help from any external landmarks or any celestial bodies at all.
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

July 5 2017, 12:00 AM
 YEP . . . Kim Jong-un's rockets failed & went astray again! ….......................................................................................................................................................... "On Earth, though, the gyroscope has to operate within gravity. Spinning at an angle (like our Oslo example), a given spot on the disc must move up (so costing energy) and then down (gaining energy). Nature will always seek equilibrium, so this must be equalised by levelling the disc - which once achieved is further enforced by the conservation of angular momentum." Well; that is true; but, fortunately for Isaac Newton, it does not help the main hypothesis of Albert Einstein at all! In a nutshell, Herr Einstein thought that Newton's absolute space is fictional, because there is no experimental evidence for its existence. But he was wrong, because every gyroscope, here on Earth & in outer space as well, is pointing, all the time, to Newton's absolute space, and nothing else beside absolute space. Is that incorrect?
AAF

# Re: You were right: Rotational motion is relative, too, Mr. Einstein!

July 7 2017, 12:00 AM
 "AAF: "Its edge was in Brisbane & its eye was in Hayman Island". Yes - and those islands around Hayman are the most gorgeous islands around. I went once to Whitehaven beach just around there - spectacular stretch of white sand in a beautiful natural environment, unspoilt .... until Debbie came along and trashed the place. Ah well, won't be long until they have it back looking as it was." That is true. But we have to admit that Cyclone Debbie, itself, was so gorgeous and beautiful too: http://www.abc.net.au/news/2017-03-28/cyclone-debbie--space-stations-capture-incredible-images/8392232 I presume!

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